[jira] [Created] (FREEMARKER-39) DefaultObjectWrapperBuilder isn't a Builder

["Brian Pontarelli (JIRA)" <ji...@apache.org>]

Brian Pontarelli created FREEMARKER-39:
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             Summary: DefaultObjectWrapperBuilder isn't a Builder
                 Key: FREEMARKER-39
                 URL: https://issues.apache.org/jira/browse/FREEMARKER-39
             Project: Apache Freemarker
          Issue Type: Bug
          Components: engine
    Affects Versions: 2.3.23
            Reporter: Brian Pontarelli


This might not be considered a bug, but I'm logging it as one rather than an improvement. The class {{DefaultObjectWrapperBuilder}} is not actually a builder right now and it makes using it inline impossible. 

To make it a more standard Builder pattern, all of the setter methods should be updated so that the return type is {{DefaultObjectWrapperBuilder}} and the method does a {{return this;}} at the end. This will make method chaining possible and inline use also possible. Since it uses inheritance extensively (you might want to consider unwinding this as well), you'll need to use generics and return T. Here's the class definition so that T works:

{code:title=DefaultObjectWrapperBuilder.java}
public class DefaultObjectWrapperBuilder extends DefaultObjectWrapperConfiguration<DefaultObjectWrapperBuilder>
{code}

And the parent class is defined like this:

{code:title=DefaultObjectWrapperConfiguration.java}
public abstract class DefaultObjectWrapperConfiguration<T> extends BeansWrapperConfiguration<T> {
{code}

That the final parent class is defined like this:

{code:title=BeansWrapperConfiguration.java}
public abstract class BeansWrapperConfiguration<T extends BeansWrapperConfiguration> implements Cloneable
{code}




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